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GLBEGINTRANSFORMFEED(3G) | [FIXME: manual] | GLBEGINTRANSFORMFEED(3G) |
NAME¶
glBeginTransformFeedback - start transform feedback operationC SPECIFICATION¶
void
glBeginTransformFeedback(GLenum primitiveMode);
PARAMETERS¶
primitiveModeSpecify the output type of the primitives that
will be recorded into the buffer objects that are bound for transform
feedback.
C SPECIFICATION¶
void
glEndTransformFeedback(void);
DESCRIPTION¶
Transform feedback mode captures the values of varying variables written by the vertex shader (or, if active, the geometry shader). Transform feedback is said to be active after a call to glBeginTransformFeedback until a subsequent call to glEndTransformFeedback(). Transform feedback commands must be paired. If no geometry shader is present, while transform feedback is active the mode parameter to glDrawArrays() must match those specified in the following table:Transform Feedback primitiveMode | Allowed Render Primitive modes |
GL_POINTS | GL_POINTS |
GL_LINES | GL_LINES, GL_LINE_LOOP, GL_LINE_STRIP, GL_LINES_ADJACENCY, GL_LINE_STRIP_ADJACENCY |
GL_TRIANGLES | GL_TRIANGLES, GL_TRIANGLE_STRIP, GL_TRIANGLE_FAN, GL_TRIANGLES_ADJACENCY, GL_TRIANGLE_STRIP_ADJACENCY |
Transform Feedback primitiveMode | Allowed Geometry Shader Output Primitive Type |
GL_POINTS | points |
GL_LINES | line_strip |
GL_TRIANGLES | triangle_strip |
NOTES¶
Geometry shaders, and the GL_TRIANGLES_ADJACENCY, GL_TRIANGLE_STRIP_ADJACENCY, GL_LINES_ADJACENCY and GL_LINE_STRIP_ADJACENCY primtive modes are available only if the GL version is 3.2 or greater.ERRORS¶
COPYRIGHT¶
Copyright © 2010 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1.0, 8 June 1999. http://opencontent.org/openpub/.05/30/2012 | [FIXME: source] |